rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (8703 ticks this GP) idle=112/1/0x4000000000000000 softirq=12090/12091 fqs=139 
	(t=10500 jiffies g=10105 q=872)
rcu: rcu_preempt kthread starved for 891 jiffies! g10105 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:29112 pid:   11 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3779 [inline]
 __schedule+0x893/0x2130 kernel/sched/core.c:4528
 schedule+0xcf/0x270 kernel/sched/core.c:4606
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1871
 rcu_gp_fqs_loop kernel/rcu/tree.c:1925 [inline]
 rcu_gp_kthread+0xb4c/0x1c90 kernel/rcu/tree.c:2099
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
NMI backtrace for cpu 0
CPU: 0 PID: 10083 Comm: syz-executor879 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:331
 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:637 [inline]
 rcu_pending kernel/rcu/tree.c:3694 [inline]
 rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567
 update_process_times+0x77/0xd0 kernel/time/timer.c:1709
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:196
Code: fc ff ff 48 c7 c7 00 d5 38 8b 48 89 54 24 08 48 89 34 24 e8 22 b3 5e 02 48 8b 54 24 08 48 8b 34 24 e9 a1 fd ff ff 0f 1f 40 00 <65> 48 8b 14 25 00 f0 01 00 65 8b 05 10 eb 91 7e a9 00 01 ff 00 48
RSP: 0018:ffffc90000007b90 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff88515dae
RDX: 0000000000000001 RSI: ffff888010e03480 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8ebb0667
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888023dd9e18
R13: ffff8880335b0c80 R14: 1ffff110047bb41b R15: dffffc0000000000
 rcu_read_unlock include/linux/rcupdate.h:691 [inline]
 ieee80211_get_buffered_bc+0x4f7/0x840 net/mac80211/tx.c:5310
 mac80211_hwsim_beacon_tx+0x503/0x910 drivers/net/wireless/mac80211_hwsim.c:1762
 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:792
 ieee80211_iterate_active_interfaces_atomic+0x8d/0x170 net/mac80211/util.c:828
 mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1782
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x693/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600
 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x132/0x200 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199
Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 3e 59 6e f8 48 89 ef e8 c6 0d 6f f8 e8 41 f7 8d f8 fb bf 01 00 00 00 <e8> 86 79 63 f8 65 8b 05 cf 23 1a 77 85 c0 74 02 5d c3 e8 3b 79 18
RSP: 0018:ffffc9000af6f518 EFLAGS: 00000206
RAX: 000000000000970f RBX: ffff888010e03480 RCX: 1ffffffff19d8e79
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffff8880b9e34980 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b9e34980
R13: ffff8880334f3480 R14: 0000000000000000 R15: 0000000000000000
 finish_lock_switch kernel/sched/core.c:3518 [inline]
 finish_task_switch+0x150/0x780 kernel/sched/core.c:3618
 context_switch kernel/sched/core.c:3782 [inline]
 __schedule+0x89b/0x2130 kernel/sched/core.c:4528
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:4789
 irqentry_exit_cond_resched kernel/entry/common.c:357 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:349 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:387
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:preempt_schedule+0x7/0x20 kernel/sched/core.c:4709
Code: ff 45 31 ed e8 3a 87 6f f8 eb d6 48 89 df e8 30 97 ca f8 eb ad e8 a9 97 ca f8 eb da 0f 1f 80 00 00 00 00 65 8b 05 19 05 1b 77 <a9> ff ff ff 7f 74 01 c3 9c 58 f6 c4 02 74 f8 e9 25 ff ff ff 0f 1f
RSP: 0018:ffffc9000af6f728 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000001
RBP: ffffc9000af6f778 R08: 0000000000000000 R09: ffff888020d1f423
R10: ffffed10041a3e84 R11: 0000000000000000 R12: ffff88801434c750
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000405000
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40
 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:183
 spin_unlock include/linux/spinlock.h:394 [inline]
 zap_pte_range mm/memory.c:1309 [inline]
 zap_pmd_range mm/memory.c:1357 [inline]
 zap_pud_range mm/memory.c:1386 [inline]
 zap_p4d_range mm/memory.c:1407 [inline]
 unmap_page_range+0xf98/0x2640 mm/memory.c:1428
 unmap_single_vma+0x198/0x300 mm/memory.c:1473
 unmap_vmas+0x168/0x2e0 mm/memory.c:1505
 exit_mmap+0x2b1/0x530 mm/mmap.c:3220
 __mmput+0x122/0x470 kernel/fork.c:1079
 mmput+0x53/0x60 kernel/fork.c:1100
 exit_mm kernel/exit.c:486 [inline]
 do_exit+0xa72/0x29b0 kernel/exit.c:796
 do_group_exit+0x125/0x310 kernel/exit.c:906
 get_signal+0x42a/0x1f10 kernel/signal.c:2758
 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x44bfc9
Code: Unable to access opcode bytes at RIP 0x44bf9f.
RSP: 002b:00007fe94eddfcd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: 0000000020ffc000 RBX: 00000000006e2c48 RCX: 000000000044bfc9
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffc000
RBP: 00000000006e2c40 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 00000000006e2c4c
R13: 00007ffcd6350adf R14: 00007fe94ede09c0 R15: 0000000000000000